Grain refinement in titanium prevents low temperature oxygen embrittlement

Yan Chong, Reza Gholizadeh, Tomohito Tsuru, Ruopeng Zhang, Koji Inoue, Wenqiang Gao, Andy Godfrey, Masatoshi Mitsuhara, J. W. Morris, Andrew M. Minor, Nobuhiro Tsuji

研究成果: ジャーナルへの寄稿学術誌査読

12 被引用数 (Scopus)

抄録

Interstitial oxygen embrittles titanium, particularly at cryogenic temperatures, which necessitates a stringent control of oxygen content in fabricating titanium and its alloys. Here, we propose a structural strategy, via grain refinement, to alleviate this problem. Compared to a coarse-grained counterpart that is extremely brittle at 77 K, the uniform elongation of an ultrafine-grained (UFG) microstructure (grain size ~ 2.0 µm) in Ti-0.3wt.%O is successfully increased by an order of magnitude, maintaining an ultrahigh yield strength inherent to the UFG microstructure. This unique strength-ductility synergy in UFG Ti-0.3wt.%O is achieved via the combined effects of diluted grain boundary segregation of oxygen that helps to improve the grain boundary cohesive energy and enhanced <c + a> dislocation activities that contribute to the excellent strain hardening ability. The present strategy will not only boost the potential applications of high strength Ti-O alloys at low temperatures, but can also be applied to other alloy systems, where interstitial solution hardening results into an undesirable loss of ductility.

本文言語英語
論文番号404
ジャーナルNature communications
14
1
DOI
出版ステータス出版済み - 12月 2023

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 生化学、遺伝学、分子生物学一般
  • 物理学および天文学一般

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